Moscow attack: video captures gunmen storming concert hall and shooting dozens dead

*** WARNING graphic content

Russia’s state security services say at least forty people are dead, and over a hundred injured, after heavily armed gunmen burst into a packed theatre near Moscow, and opened fire.

It happened at the Crocus Concert Hall, part of which is in flames, after explosives were detonated.

Video images show the gunmen, in military camouflage, walking through the venue and shooting their victims.

Ukraine has said it had nothing to do with the atrocity.

The Islamic State group has said that it was behind the attack but that has not been confirmed.

Clive Myrie presents BBC News at Ten reporting by Steve Rosenberg in Moscow, Sarah Smith in Washington, Sarah Rainsford in Kyiv and security correspondent Gordon Corera.